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From |
Yuval Arbel <yuval.arbel@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: variable not found? |

Date |
Mon, 24 Oct 2011 11:54:06 +0200 |

Paul, It seems the purpose of this exercise is to show you that running a regression on a dummy variable GROUP is an elegant way to find whether the difference of means between the groups is significant or not. I ran below the mvreg based on the data you gave. Note, for example, that while the motivation for GROUP=1 decreases by 7.428 points, this coeffiecient is insignificant (t-value of -0.62). It implies that statisticallty there are no motivation differences between the two groups. On the other hand, the motivation for GROUP=1 is lower by 7.428 points In other words, the test . mvreg motiv aspire algebra geom = group Equation Obs Parms RMSE "R-sq" F P ---------------------------------------------------------------------- motiv 8 2 16.44815 0.0599 .3823938 0.5591 aspire 8 2 12.11901 0.0090 .0543859 0.8234 algebra 8 2 13.90122 0.1842 1.354984 0.2886 geom 8 2 11.11769 0.1715 1.241692 0.3078 ------------------------------------------------------------------------------ | Coef. Std. Err. t P>|t| [95% Conf. Interval] -------------+---------------------------------------------------------------- motiv | group | -7.428001 12.01203 -0.62 0.559 -36.82039 21.96439 _cons | 55.73 9.496346 5.87 0.001 32.49328 78.96672 -------------+---------------------------------------------------------------- aspire | group | -2.063999 8.850472 -0.23 0.823 -23.72032 19.59233 _cons | 73.02 6.996913 10.44 0.000 55.89917 90.14083 -------------+---------------------------------------------------------------- algebra | group | -11.81733 10.15202 -1.16 0.289 -36.65842 13.02376 _cons | 62.40333 8.025874 7.78 0.000 42.76473 82.04194 -------------+---------------------------------------------------------------- geom | group | -9.047335 8.11921 -1.11 0.308 -28.91433 10.81966 _cons | 78.57333 6.418799 12.24 0.000 62.8671 94.27957 ------------------------------------------------------------------------------ On Mon, Oct 24, 2011 at 3:53 AM, Paul Burkander <paul@burkander.com> wrote: > Hi all, > > I'm trying to help my wife do some stata homework, and we've run into > some odd behavior. > > Below is a sample of the data. She's supposed to do a manova of > MOTIV,ASPIRE,ALGEBRA,GEOM, on GROUP , then mvreg, then test the > restriction that the coefficients on GROUP are zero in all four > equations. After doing the manova and mvreg, we typed test GROUP, but > receive the error message "GROUP not found." > > Any ideas? Perhaps we're doing something dumb? She entered the data > by pasting into the data editor. We're using Stata 11 SE and I just > did a full update. > > Thanks, Paul > > MOTIV,ASPIRE,ALGEBRA,GEOM,GROUP > 74.31,78.57,68.59,78.57,1 > 27.15,61.91,37.15,71.43,1 > 64.31,90.48,67.16,83.34,1 > 40.01,64.29,48.59,59.53,1 > 35.73,59.53,31.44,54.76,1 > 55.73,83.34,60.02,85.72,0 > 52.87,64.29,62.88,69.05,0 > 58.59,71.43,64.31,80.95,0 > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Dr. Yuval Arbel School of Business Carmel Academic Center 4 Shaar Palmer Street, Haifa, Israel e-mail: yuval.arbel@gmail.com * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: variable not found?***From:*Paul Burkander <paul@burkander.com>

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